Participant Name Exam Date. Procedure Element Trial 1 Trial 2

Transcription

1 CONCRETE WAQTC WAQTC TM 2 (13) SAMPLING FRESHLY MIXED CONCRETE FOP FOR WAQTC TM 2 PERFORMANCE EXAM CHECKLIST Participant Name Exam Date Record the symbols P for passing or F for failing on each step of the checklist. 1. Receptacle dampened and excess water removed? 2. Obtain a representative sample from drum mixer: a. Concrete sampled after 1/2 m 3 (1/2 yd 3 ) discharged? b. Receptacle passed through entire discharge stream or discharge stream completely diverted into sampling container? 3. Obtain a representative sample from a paving mixer: a. Concrete sampled after all the concrete has been discharged? b. Material obtained from at least 5 different locations in the pile? c. Avoid contaminating the sample with sub-grade materials. 4. Obtain a representative sample from a pump: a. Concrete sampled after 1/2 m 3 (1/2 yd 3 ) has been discharged? b. All the pump slurry is out of the lines? c. Receptacle passed through entire discharge stream or discharge stream completely diverted into sampling container? d. Do not lower the pump arm from the placement position. 5. Samples transported to place of testing? 6. Sample(s) combined, or remixed, or both? 7. Sample protected? 8. Minimum size of sample used for strength tests 0.03 m 3 (1ft 3 )? 9. Completed temperature test within 5 minutes of obtaining sample? 10. Start tests for slump and air within 5 minutes of obtaining sample? 11. Start molding cylinders within 15 minutes of obtaining sample? 12. Protect sample against rapid evaporation and contamination? OVER 17_WAQTC_TM2_pr_13 Concrete 3-9 Pub. October 2018

2 CONCRETE WAQTC WAQTC TM 2 (13) 13. Wet Sieving: a. Required sieve size determined for test method to be performed? b. Concrete placed on sieve and doesn t overload the sieve. c. Sieve shaken until no more material passes the sieve. d. Sieving continued until required testing size obtained. e. Oversized aggregate discarded. f. Sample remixed. Comments: First attempt: Pass Fail Second attempt: Pass Fail Examiner Signature WAQTC #: This checklist is derived, in part, from copyrighted material printed in ACI CP-1, published by the American Concrete Institute. 17_WAQTC_TM2_pr_13 Concrete 3-10 Pub. October 2018

3 CONCRETE WAQTC WAQTC TM 2 (18) SAMPLING FRESHLY MIXED CONCRETE FOP FOR WAQTC TM 2 PERFORMANCE EXAM CHECKLIST (ORAL) Participant Name Exam Date Record the symbols P for passing or F for failing on each step of the checklist. 1. What is the minimum sample size? a m3 or 1 ft3 2. Describe the surface of the receptacle before the sample is introduced into it? a. It must be dampened. 3. Describe how to obtain a representative sample from a drum mixer. a. Sample the concrete after 1/2 m3 (1/2 yd3) has been discharged. b. Pass receptacle through entire discharge stream or completely divert discharge stream into sampling container. 4. Describe how to obtain a representative sample from a paving mixer. a. Sample the concrete after all the concrete has been discharged. b. Obtain the material from at least 5 different locations in the pile. c. Avoid contaminating the sample with sub-grade materials. 5. Describe how to obtain a representative sample from a pump: a. Sample the concrete after 1/2 m3 (1/2 yd3) has been discharged. b. Make sure all the pump slurry is out of the lines. c. Pass receptacle through entire discharge stream or completely divert discharge stream into sampling container. d. Do not lower the pump arm from the placement position. 6. After obtaining the sample or samples what must you do? a. Transport samples to place of testing. 7. What must be done with the sample or samples once you have transported them to the place of testing? a. Combine and remix the sample. b. Protect sample against rapid evaporation and contamination. OVER 18_WAQTC_TM2_pr_oral_18 Concrete 3-11 Pub. October 2018

4 CONCRETE WAQTC WAQTC TM 2 (18) 8. What are the two time parameters associated with sampling? a. Complete temperature test and start tests for slump and air within 5 minutes of sample being obtained? b. Start molding cylinders within 15 minutes of sample being obtained? 9. What test methods may require wet sieving? a. Slump, air content, and strength specimens? 10. The sieve size used for wet sieving is based on? a. The test method to be performed. 11. How long must you continue wet sieving? a. Until a sample of sufficient size for the test being performed is obtained. 12. What is done with the oversized aggregate? a. Discard it. 13. What must be done to the sieved sample before testing? a. Remix. Comments: First attempt: Pass Fail Second attempt: Pass Fail Examiner Signature WAQTC #: This checklist is derived, in part, from copyrighted material printed in ACI CP-1, published by the American Concrete Institute. 18_WAQTC_TM2_pr_oral_18 Concrete 3-12 Pub. October 2018

5 CONCRETE WAQTC FOP AASHTO T 309 (09) PERFORMANCE EXAM CHECKLIST TEMPERATURE OF FRESHLY MIXED CONCRETE FOP FOR AASHTO T 309 Participant Name Exam Date Record the symbols P for passing or F for failing on each step of the checklist. 1. Obtain sample of concrete large enough to provide a minimum of 75 mm (3 in.) of concrete cover around sensor in all directions? 2. Place temperature measuring device in sample with a minimum of 75 mm (3 in.) cover around sensor? 3. Gently press concrete around thermometer? 4. Read temperature after a minimum of 2 minutes or when temperature reading stabilizes? 5. Complete temperature measurement within 5 minutes of obtaining sample? 6. Record temperature to nearest 0.5 C (1 F)? Comments: First attempt: Pass Fail Second attempt: Pass Fail Examiner Signature WAQTC #: This checklist is derived, in part, from copyrighted material printed in ACI CP-1, published by the American Concrete Institute. 21_T309_pr_09 Concrete 4-7 Pub. October 2018

6 CONCRETE WAQTC FOP AASHTO T 309 (09) 21_T309_pr_09 Concrete 4-8 Pub. October 2018

7 CONCRETE WAQTC FOP AASHTO T 119 (16) PERFORMANCE EXAM CHECKLIST SLUMP OF HYDRAULIC CEMENT CONCRETE FOP FOR AASHTO T 119 Participant Name Exam Date Record the symbols P for passing or F for failing on each step of the checklist. First layer 1. Mold and floor or base plate dampened? 2. Mold held firmly against the base by standing on the two foot pieces? Mold not allowed to move in any way during filling? 3. Representative sample scooped into the mold, moving a scoop around the perimeter of the mold to evenly distribute the concrete as discharged? 4. Mold approximately one third (by volume), 67 mm (2 5/8 in.) deep? 5. Layer rodded throughout its depth 25 times with hemispherical end of rod, uniformly distributing strokes? Second layer 6. Representative samples scooped into the mold, moving a scoop around the perimeter of the mold to evenly distribute the concrete as discharged? 7. Mold filled approximately two thirds (by volume), 155 mm (6 1/8 in.), deep? 8. Layer rodded throughout its depth 25 times with hemispherical end of rod, uniformly distributing strokes, penetrate approximately 25 mm (1 in.) into the bottom layer? Third layer 9. Representative sample scooped into the mold, moving a scoop around the perimeter of the mold to evenly distribute the concrete as discharged?? 10. Mold filled to just over the top of the mold? 11. Layer rodded throughout its depth 25 times with hemispherical end of rod, uniformly distributing strokes, penetrate approximately 25 mm (1 in.) into the second layer? 12. Excess concrete kept above the mold at all times while rodding? 13. Concrete struck off level with top of mold using tamping rod? OVER 24_T119_pr_16 Concrete 5-7 Pub. October 2018

8 CONCRETE WAQTC FOP AASHTO T 119 (16) 14. Concrete removed from around the outside bottom of the mold? 15. Mold lifted upward 300 mm (12 in.) in one smooth motion, without a lateral or twisting motion of the mold, in 5 ±2 seconds? 16. Test performed from start of filling through removal of the mold within 2 1/2 minutes? 17. Slump immediately measured to the nearest 5 mm (1/4 in.) from the top of the mold to the displaced original center of the top surface of the specimen? Comments: First attempt: Pass Fail Second attempt: Pass Fail Examiner Signature WAQTC #: This checklist is derived, in part, from copyrighted material printed in ACI CP-1, published by the American Concrete Institute. 24_T119_pr_16 Concrete 5-8 Pub. October 2018

9 CONCRETE WAQTC FOP AASHTO T 121 (17) PERFORMANCE EXAM CHECKLIST DENSITY (UNIT WEIGHT), YIELD, AND AIR CONTENT (GRAVIMETRIC) OF CONCRETE FOP FOR AASHTO T 121 Participant Name Exam Date Record the symbols P for passing or F for failing on each step of the checklist. 1. Mass and volume of empty measure determined? First Layer 2. Dampened measure filled approximately one third full, moving a scoop around the perimeter of the measure to evenly distribute the concrete as discharged? 3. Layer rodded throughout its depth 25 times, without forcibly striking the bottom of the measure, with hemispherical end of rod, uniformly distributing strokes? 4. Perimeter of the measure tapped 10 to 15 times with the mallet after rodding? Second layer 5. Measure filled approximately two thirds full, moving a scoop around the perimeter of the measure to evenly distribute the concrete as discharged? 6. Layer rodded throughout its depth, just penetrating the previous layer (approximately 25 mm (1 in.) 25 times with hemispherical end of rod, uniformly distributing strokes? 7. Perimeter of the measure tapped 10 to 15 times with the mallet after rodding? Third layer 8. Measure slightly overfilled, moving a scoop around the perimeter of the measure to evenly distribute the concrete as discharged? 9. Layer rodded throughout its depth, just penetrating the previous layer (approximately 25 mm (1 in.) 25 times with hemispherical end of rod, uniformly distributing strokes? 10. Perimeter of the measure tapped 10 to 15 times with the mallet after rodding each layer? 11. Any excess concrete removed using a trowel or a scoop, or small quantity of concrete added to correct a deficiency, after consolidation of final layer? OVER 27_T121_pr_17 Concrete 6-19 Pub. October 2018

10 CONCRETE WAQTC FOP AASHTO T 121 (17) 12. Strike-off plate placed flat on the measure covering approximately 2/3 of the surface, then sawing action used to withdraw the strike-off plate across the previously covered surface? 13. Strike-off plate placed flat on the measure covering approximately 2/3 of the surface, then sawing action used to advance the plate across the entire measure surface? 14. Strike off completed using the inclined edge of the plate creating a smooth surface? 15. All excess concrete cleaned off and mass of full measure determined? 16. Net mass calculated? 17. Density calculated correctly? Comments: First attempt: Pass Fail Second attempt: Pass Fail Examiner Signature WAQTC #: This checklist is derived, in part, from copyrighted material printed in ACI CP-1, published by the American Concrete Institute. 27_T121_pr_17 Concrete 6-20 Pub. October 2018

11 CONCRETE WAQTC FOP AASHTO T 152 (17) PERFORMANCE EXAM CHECKLIST AIR CONTENT OF FRESHLY MIXED CONCRETE BY THE PRESSURE METHOD FOP FOR AASHTO T 152 Participant Name Exam Date Record the symbols P for passing or F for failing on each step of the checklist. 1. Representative sample selected? First Layer 2. Dampened measure filled approximately one third full, moving a scoop around the perimeter of the measure to evenly distribute the concrete as discharged? 3. Layer rodded throughout its depth 25 times, without forcibly striking the bottom of the measure, with hemispherical end of rod, uniformly distributing strokes? 4. Perimeter of the measure tapped 10 to 15 times with the mallet after rodding? Second layer 5. Measure filled approximately two thirds full, moving a scoop around the perimeter of the measure to evenly distribute the concrete as discharged? 6. Layer rodded throughout its depth, just penetrating the previous layer (approximately 25 mm (1 in.) 25 times with hemispherical end of rod, uniformly distributing strokes? 7. Perimeter of the measure tapped 10 to 15 times with the mallet after rodding? Third layer 8. Measure slightly overfilled, moving a scoop around the perimeter of the measure to evenly distribute the concrete as discharged? 9. Layer rodded throughout its depth, just penetrating the previous layer (approximately 25 mm (1 in.)) 25 times with hemispherical end of rod, uniformly distributing strokes? 10. Perimeter of the measure tapped 10 to 15 times with the mallet after rodding each layer? 11. Concrete struck off level with top of the measure using the bar or strike-off plate and rim cleaned off? 12. Top flange of base cleaned? OVER 30_T152_pr_17 Concrete 7-13 Pub. October 2018

12 CONCRETE WAQTC FOP AASHTO T 152 (17) Using a Type B Meter: 13. Both petcocks open? 14. Air valve closed between air chamber and the measure? 15. Inside of cover cleaned and moistened before clamping to base? 16. Water injected through petcock until it flows out the other petcock? 17. Water injection into the petcock continued while jarring and or rocking the meter to insure all air is expelled? 18. Air pumped up to just past initial pressure line? 19. A few seconds allowed for the compressed air to stabilize? 20. Gauge adjusted to the initial pressure? 21. Both petcocks closed? 22. Air valve opened between chamber and measure? 23. The outside of measure tapped smartly with the mallet? 24. With the main air valve open, gauge lightly tapped and air percentage read to the nearest 0.1 percent? 25. Air valve released or closed and then petcocks opened to release pressure before removing the cover? 26. Aggregate correction factor applied if required? 27. Air content recorded to 0.1 percent? Comments: First attempt: Pass Fail Second attempt: Pass Fail Examiner Signature WAQTC #: This checklist is derived, in part, from copyrighted material printed in ACI CP-1, published by the American Concrete Institute. 30_T152_pr_17 Concrete 7-14 Pub. October 2018

13 CONCRETE WAQTC FOP AASHTO T 23 (17) PERFORMANCE EXAM CHECKLIST MAKING AND CURING CONCRETE TEST SPECIMENS IN THE FIELD FOP FOR AASHTO T 23 (4 X 8) Participant Name Record the symbols P for passing or F for failing on each step of the checklist. Exam Date 1. Molds placed on a level, rigid, horizontal surface free of vibration? 2. Representative sample selected? 3. Making of specimens begun within 15 minutes of sampling? First layer 4. Concrete placed in the mold, moving a scoop or trowel around the perimeter of the mold to evenly distribute the concrete as discharged? 5. Mold filled approximately half full? 6. Layer rodded throughout its depth 25 times with hemispherical end of rod, uniformly distributing strokes? 7. Sides of the mold tapped times after rodding? a. With mallet for reusable steel molds b. With the open hand for flexible light-gauge molds Second layer 8. Concrete placed in the mold, moving a scoop or trowel around the perimeter of the mold to evenly distribute the concrete as discharged? 9. Mold slightly overfilled on the last layer? 10. Layer rodded 25 times with hemispherical end of rod, uniformly distributing strokes and penetrating 25 mm (1 in.) into the underlying layer? 11. Sides of the mold tapped times after rodding each layer? a. With mallet for reusable steel molds b. With the open hand for flexible light-gauge molds 12. Concrete struck off with tamping rod, float or trowel? 13. Specimens covered with non-absorptive, non-reactive cap or plate? 14. Initial curing addressed? OVER 33_T23_pr_4x8_17 Concrete 8-13 Pub. October 2018

14 CONCRETE WAQTC FOP AASHTO T 23 (17) Comments: First attempt: Pass Fail Second attempt: Pass Fail Examiner Signature WAQTC #: This checklist is derived, in part, from copyrighted material printed in ACI CP-1, published by the American Concrete Institute. 33_T23_pr_4x8_17 Concrete 8-14 Pub. October 2018

15 CONCRETE WAQTC FOP AASHTO T 23 (17) PERFORMANCE EXAM CHECKLIST MAKING AND CURING CONCRETE TEST SPECIMENS IN THE FIELD FOP FOR AASHTO T 23 (6 X 12) Participant Name Record the symbols P for passing or F for failing on each step of the checklist. Exam Date 1. Molds placed on a level, rigid, horizontal surface free of vibration? 2. Representative sample selected? 3. Making of specimens begun within 15 minutes of sampling? First layer 4. Concrete placed in the mold, moving a scoop or trowel around the perimeter of the mold to evenly distribute the concrete as discharged? 5. Mold filled approximately one third full? 6. Layer rodded throughout its depth 25 times with hemispherical end of rod, uniformly distributing strokes? 7. Sides of the mold tapped times after rodding each layer? a. With mallet for reusable steel molds b. With the open hand for flexible light-gauge molds Second layer 8. Concrete placed in the mold, moving a scoop or trowel around the perimeter of the mold to evenly distribute the concrete as discharged? 9. Mold filled approximately two thirds full? 10. Layer rodded 25 times with hemispherical end of rod, uniformly distributing strokes and penetrating 25 mm (1 in.) into the underlying layer? 11. Sides of the mold tapped times after rodding? a. With mallet for reusable steel molds b. With the open hand for flexible light-gauge molds Third layer 12. Concrete placed in the mold, moving a scoop or trowel around the perimeter of the mold to evenly distribute the concrete as discharged? OVER 34_T23_pr_6x12_17 Concrete 8-15 Pub. October 2018

16 CONCRETE WAQTC FOP AASHTO T 23 (17) 13. Mold slightly overfilled on the last layer? 14. Layer rodded 25 times with hemispherical end of rod, uniformly distributing strokes and penetrating 25 mm (1 in.) into the underlying layer? 15. Sides of the mold tapped times after rodding? a. With mallet for reusable steel molds b. With the open hand for flexible light-gauge molds 16. Concrete struck off with tamping rod, straightedge, float, or trowel? 17. Specimens covered with non-absorptive, non-reactive cap or plate? 18. Initial curing addressed? Comments: First attempt: Pass Fail Second attempt: Pass Fail Examiner Signature WAQTC #: This checklist is derived, in part, from copyrighted material printed in ACI CP-1, published by the American Concrete Institute. 34_T23_pr_6x12_17 Concrete 8-16 Pub. October 2018